Instead of theoretically, instabilities in the chemical network of
the CO-electroxidation is analysed experimentally in the third
chapter for a fundamental electrochemical cell of three-electrode.
So, full parameter space is inspected and the temporal behaviour
registered. Solely bistability is exhibited during
CO-electroxidation, while oscillations are observed in presence of
an extra surface process; the third chapter proposes a general
principle regarding the mechanism in (electro)catalysis:
three-degrees of freedom as a minimum requirement for harmonic
oscillations (the fundamental oscillatory pattern). With that, in
presence of hydrogen, the CO-electroxidation exhibit pretty
harmonic oscillations; however, in a practical fuel cell, it
exhibit chaotic pattern. Trends and usefulness of that chaotic
behaviour is analysed in the first chapter, while second chapter
analyses the activation energy under oscillations. Finally, the
ending chapter presents an energetic balance for stationary and
oscillatory states, laying foundation for the empirical and
theoretical calculation of the thermodynamic efficiency for an
electrochemical oscillator known as HNDR.